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C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
C21D11/00—Process control or regulation for heat treatments
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FR487496D1917-06-261917-11-09Méthode pour indiquer l'état du fer, de l'acier ou d'autres métaux magnétisables, pendant leur traitement par la chaleur
ExpiredFR487496A
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Procédé de détermination du moment oÙ des métaux passent par un point critique au cours d'un traitement par la chaleur auquel on les soumet pour la trempe, l'affinage ou la recuisson